Different check values is not ABI compatible. For example if on migration we change 'full' to 'partial' then guest cpu on destination can be different. Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy(a)virtuozzo.com&gt; --- src/conf/cpu_conf.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/src/conf/cpu_conf.c b/src/conf/cpu_conf.c index 33c8b99..bd2beab 100644 --- a/src/conf/cpu_conf.c +++ b/src/conf/cpu_conf.c @@ -894,6 +894,13 @@ virCPUDefIsEqual(virCPUDefPtr src, goto cleanup; } + if (src->check != dst->check) { + MISMATCH(_("Target CPU check %s does not match source %s"), + virCPUCheckTypeToString(dst->check), + virCPUCheckTypeToString(src->check)); + goto cleanup; + } + if (src->arch != dst->arch) { MISMATCH(_("Target CPU arch %s does not match source %s"), virArchToString(dst->arch), -- 1.8.3.1